That is an interesting article, but it is not as straightforward as would appear. For example, they list my birth country (Kenya) as number 32. Number 32 ...worse than Kuwait and Bhutan, worse than the Central African Republic where Muslims and Christians are at civil war, worse than Mali (majority moslem, with Alqaeda in the Mahgreb mucking up things), worse than Indonesia (the most populous Muslim country in the world), worse than Bangladesh and Sri Lanka (where the penalty for changing faith is a violent death), worse than China (where Christians attend service in under-ground churches and keep their faith a secret).
According to the list, Kenya - a country with more churches than hospitals (unfortunately), and which (according to the Joshua Project) has one of the highest 'success rates' of Christianity in Africa, with 78% of the people being Christian (and professing rather than 'census' Christians, with 48% of those strong evangelicals) - has a 'very high' rating of persecution according to Christianity Today.
I literally started laughing and mentally filing the article under the 'silly stories from the West' section of my mind, but then decided to take some time to re-read it and try and understand how they could come up with such a ridiculous assertion. That is when I understood the angle they took for Kenya, which while still silly is still a way of looking at things (and may explain why India is only 3 places removed from Saudi Arabia according to them).
According to OpenDoorsUSA.org (which tracks violence against Christians ...and of course will ask for a generous donation if possible ...), they stated that "In December 2015, two passengers on a bus were killed when al-Shabaab militants boarded and separated Christians for execution. In January 2016, five policemen who were Christians and three Christian men were murdered in their homes in the Lamu area. During the World Watch List 2017 reporting period, more than 30 Christians were killed at the hands of Islamists."
They basically took those (very real and disappointing) attacks and used them to show Christians have a 'very high' level of persecution. While it is true that Al Shabaab (the Sunni Islamic terror group from Somalia that tries to cross the border every now and then, and when they succeed they kill and maim) will kill Christians, I believe that they are targeting Kenyans (most of whom are Christians) rather than targeting Christians.
There is a difference between persecution against Christians and acts of terrorism against Christians ...it would be like me claiming that the 2,996 9/11 victims show that the US has a 'very high level' of persecution against Christians. That would be ludicrous, as is the assertion that Christians face more persecution in Kenya than in CAR, China, etc.
Bottomline: They probably did the same thing for India. There was a riot a year or three ago where Hindu mobs assaulted (and I believe killed??) some Christians in a rural village. So, maybe in the same way that Kenyans - I mean, Christians - murdered by Al Shabaab in a terrorist attack skewed Kenya's numbers, maybe the same happened for India.
But I can bet good money that Christians in 'highly persecuted' India or 'very persecuted' Kenya would never exchange their position with 'less persecuted' Christians in China ...
As an aside ...this is why I always say its important to understand where numbers from statistics are coming from. Often it is hot air, many times fetid hot air.